Grate.



P. W. HARRIS.

GRATE.

APPLICATION FILED SEPT. 12, 1912.

Patented Apr. 8, 1913.

gaf/VW@ 'NETE STATS PATENT FFC.

GRATE.

To all whom. t may concern:

Be it known that I, FRANK lV. HARRIS, of Fayetteville, in the county of GnOndaga, in the State of New York, have invented new and useful Improvements in Grates, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improvements in grates for boilers, furnaces and stoves and other heating apparatus for burning solid fuel and refers more particularly to the construction and relative arrangement of the grate-bars.

The main object is to enable the gratebars to be shaken for discharge of the ine ashes therefrom without liability of dumping the live coals and at the same time permitting the entire body of fuel and ashes to be gradually discharged or dumped when desired without displacing the grate-bars from their normal operative position in the manner hereinafter more fully described.

Other objects and uses will be brought out in the following description.

ln the drawings-Figure 1 is a top plan of a. system of grate-bars and a supportingframe therefor together with means for simultaneously rotating or rocking all of the grate-bars. Fig. 2 is an enlarged plan of one of the grate-bars. Fig. 3 is a still further enlarged end view of one of said bars. Fig. Ll-is an enlarged transverse sectional view of the same bar taken on line 4 4, Fig. 2.

As illustrated, this grate comprises a main supporting-frame -land a plurality of, in this instance four, cylindrical grate-bars -2 arranged side by side in parallelism with their meeting faces in close proximity but slightly separated to avoid contact and permit the finer ashes to sift through the intervening spaces, the ends of t-he bars being reduced in diameter, and are journaled in suitable bearings in the adjacent end's or sides of the main supporting-frame -l-.

The bearings at one end of the frame are preferably open at the top to permit the bars to be readily inserted and removed when desired and the adjacent ends of the grate-bars are provided with intermeshing gears -3- preferablyy of the same size for simultaneously rotating the bars and causing their meeting faces to travel in the same direction or in rolling relation to each other.

One end as -2- of one of the grate-bars Specification of Letters Patent.

Application led September 12, 1912.

Patented Apr. 8, i913.

serial No. 719,969.

protrudes slightly beyond the corresponding -ends of the other bars as shown in Fig. 1 and is angular in cross section for the reception of a suitable implement whereby the grate-bars may be rocked or rotated to remove the ashes or dump the fuel in the manner hereinafter more fully described.

Each grate-bar is provided with one or more, in this instance two, diametrically opposite spiral grooves trunning lengthwise in the periphery thereof from end to end and preferably curved in cross section and is also provided with a series of annular grooves -5- of uniform width intersecting the spiral grooves 4- and forming a series of intervening annular ribs -6- which are also of uniform width substantially equal to the width of the intervening grooves -5-. rlhese ribs and grooves, therefore, alternate with each other throughout the length of the bar and are provided in their peripheries with diametrically opposite spiral recesses forming portions of the spiral grooves al- Each spiral groove preferably extends once around the periphery of the bar and, therefore, terminates at its ends at one and the same side of said bar. These bars are assembled in the frame in such manner that their annular grooves are in transverse alinement with each other and, therefore, the annular ribs of adjacent bars are also in transverse alinement, the spiral grooves in adjacent bars being arranged in reverse order or inclination so that the spiral recesses in the annular ribs of adjacent bars will progressively register with each other from end to end or from any intermediate point toward either end as the bars are rotated.

In assembling the bars in the manner just described, it is evident that a series of pockets will be progressively formed by the recesses in adjacent faces of coacting ribs into which pockets the ashes or fuel or both gravitate and may be discharged therefrom at will by the rotation of the bars, such discharge, however, being gradual for the reason that only one pocket is formed at a time by the registering recesses of coacting ribs. lnthis mannenl am able to shake the grate to free it from ashes without liability of dumping the fuel, while on the other hand, if it is desired to dump the lfuel with the ashes, it is simply necessary to rotate the grate-bars continuously in one or the opposite direction, in which case the downwardly moving upper sides of the recesses at the meeting faces of adjacent bars will operate to force the ashes and fuel downwardly but progressively from one end toward the opposite end oi' the grate-bars.

I'Vhat- I claim is:

1. In a grate, a grate bar having annular ribs spaced apart and provided with registering recesses in their peripheries,arranged to form spiral grooves lengthwise of the bar.

2. In a grate7 a grate bar having annular ribs spaced uniform distances apart and provided with registering recesses in their periplieries arranged to form spiral grooves lengthwise ot' the bar.

8. In a grate, a grate bar having annular ribs of uniform width spaced equi-distant apart substantially equal to the width of the ribs and provided with registering recesses in their peripheries arranged to form spiral grooves.

il. In a grate, a cylindrical grate bar having lengthwise spiral grooves in its periphery and annular grooves intersecting the spiral grooves.

5. A grate composed oi' cylindrical grate bars arranged side by side and provided with lengthwise spiral grooves and annular grooves intersecting the spiral grooves.

6. A grate composed of cylindrical grate bars arranged side by side and provided with lengthwise spiral grooves and annular grooves intersecting the spiral grooves, the annular grooves of adjacent bars being alined transversely.

7. A grate composed of cylindrical grate bars arranged side by side and provided with lengthwise spiral grooves of the same pitch and annular grooves intersectingthe spiral grooves,the spiral grooves of adjacent bars being disposed to progressively register with each other at all points in their lengths as the bars are rotated7 and means for simultaneously rotating the bars at the same speed.

8. In a grate, a grate bar provided with annular ribs positioned at regular intervals thereon and a recess in the periphery ol' each rib registering to form a spiral channel lengthwise of the bar, broken by the spaces between the ribs.

In witness whereof I have hereunto set my hand this Gthday of September 1912.

FRANK W. HARRIS.

fitnesses E. C. THOMPSON, EVA E. GREENLEAF.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

